按鈕群組 - Button Groups

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<div class="btn-group-separator">
  <div class="btn-group">
    <button type="button" class="btn btn-secondary btn-first">Left</button><!--
    --><button type="button" class="btn btn-secondary">Middle</button><!--
    --><button type="button" class="btn btn-secondary btn-last">Right</button>
  </div>

  <div class="btn-group" role="group" aria-label="Button group with nested dropdown">
    <button type="button" class="btn btn-secondary btn-first">1</button><!--
    --><button type="button" class="btn btn-secondary">2</button><!--
    --><div class="btn-group" role="group">
      <button id="btnGroupDrop1"
              type="button"
              class="btn btn-secondary btn-last"
              data-dropdown
              data-target="btn-group-dropdown"
              aria-haspopup="true"
              aria-expanded="false">
        Dropdown
      </button>
      <div class="dropdown-menu"
           aria-labelledby="btnGroupDrop1"
           data-dropdown-menu="btn-group-dropdown"
           data-align="left">
        <a class="dropdown-item" href="#">Dropdown link</a>
        <a class="dropdown-item" href="#">Dropdown link</a>
      </div>
    </div>
  </div>
</div>

<div class="btn-group-separator">
  <div class="btn-group">
    <button type="button" class="btn btn-first">Left</button><!--
    --><button type="button" class="btn">Middle<span class="badge">25</span></button><!--
    --><button type="button" class="btn btn-last">Right<span class="badge">2</span></button>
  </div>
</div>